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h(-3)=3-2(-3)
We move all terms to the left:
h(-3)-(3-2(-3))=0
We add all the numbers together, and all the variables
h(-3)-9=0
We multiply parentheses
-3h-9=0
We move all terms containing h to the left, all other terms to the right
-3h=9
h=9/-3
h=-3
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